Seven traits Mendel studied?

The seven traits Mendel studied were on separate chromosomes. Why was this fortunate? What if the traits
were all close together on the same chromosome?

Mendel was investigating the behavior of genes. He was fortunate in choosing traits coded by genes that happened to be on different chromosomes or far apart on the same chromosome. When genes are linked or near each other on the same chromosome, patterns of segregation and independent assortment change.